iceberg

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iceberg,

mass of ice that has become detached, or calved, from the edge of an ice sheet or glacier and is floating on the ocean. Because ice is slightly less dense than water about one ninth of the total mass of a berg projects above the water. Greenland and other N Atlantic icebergs are usually peaked and irregular in shape; Antarctic icebergs are tabular, with flat tops and steep sides. Icebergs differ from other ocean ices: sea ice is formed directly from the freezing of ocean water; pack ice is tightly packed fragments of sea ice; ice floes are small, floating ice fragments that separate from pack ice; and fast ice is ice attached to a shore.

Greenland is the source of most of the icebergs in the N Atlantic, where the iceberg season lasts roughly from February to October. As a consequence of the loss of the Titanic through collision with an iceberg in 1912, a patrol of N Atlantic shipping channels was initiated in 1914 by the international agreement of 16 nations. Patrols use planes and surface vessels equipped with radar, loran, and underwater sound equipment. A constant census of bergs is maintained, and the location of an iceberg is reported to any ship in its vicinity.

iceberg

[′īs‚bərg]
(oceanography)
A large mass of glacial ice broken off and drifted from parent glaciers or ice shelves along polar seas; it is distinguished from polar pack ice, which is sea ice, and from frozen seawater, whose rafted or hummocked fragments may resemble small icebergs.

iceberg

a large mass of ice floating in the sea, esp a mass that has broken off a polar glacier
References in periodicals archive ?
Means of square Leaves Harvesting Root Fresh Root Dry fresh date variety weight (g) weight (g) weight (g) 19 February Ice berg 16 f 2.
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The unfortunate truth is that the companies undergoing voluntary audits with the PWC are possibly just the tip of the ice berg.
Reports of deaths of children by water-borne diseases are just tip of the ice berg.
Thierry Henry salutes his goal which put Arsenal 3-2 up - but it still wasn't enough; GILLESPIE celebrates his strike; ICE BERG .
It would appear that Corvin is just the tip of the the ice berg when it comes to clubbing, and that submerged, out of sight for the moment, is a strong clubbing scene with its own distinct flavour.
There is just one, small obstacle preventing the Ice Berg realising his boyhood dream - Manchester United.
There's also Ice Berg - a measure of Pernod, a dash of Creme de Menthe, five parts of lemonade and lots of ice - and High Flyer - a measure of Pernod, three parts of orange juice, three parts of lemonade and ice.
With the economy in recovery we are seeing the tip of the ice berg in IBM's ability to land major contracts.